Pittsburgh performed extremely well in every category measured, with the exception of Internet usage, for which it ranked 42nd among the cities. Pittsburgh is not a particularly wealthy city, with a 2011 median income of $35,947, compared to the national median of $50,502. However, the city also has very little poverty, with just 10.4% of residents living below the poverty line, versus 15.1% nationwide. The city's libraries and booksellers are among its biggest strengths. Pittsburgh has more independent bookstores, relative to population, than any city in the country.